EP1207563A2 - Direct bonding of flip-chip light-emitting diode and flip-chip ESD protection chip to electrodes in a package - Google Patents

Direct bonding of flip-chip light-emitting diode and flip-chip ESD protection chip to electrodes in a package Download PDF

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Publication number
EP1207563A2
EP1207563A2 EP01204132A EP01204132A EP1207563A2 EP 1207563 A2 EP1207563 A2 EP 1207563A2 EP 01204132 A EP01204132 A EP 01204132A EP 01204132 A EP01204132 A EP 01204132A EP 1207563 A2 EP1207563 A2 EP 1207563A2
Authority
EP
European Patent Office
Prior art keywords
flip
led
power shunting
light
emitting diode
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP01204132A
Other languages
German (de)
French (fr)
Other versions
EP1207563A3 (en
Inventor
Steven A. Maranowski
Daniel A. Steigerwald
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lumileds LLC
Original Assignee
Lumileds LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lumileds LLC filed Critical Lumileds LLC
Publication of EP1207563A2 publication Critical patent/EP1207563A2/en
Publication of EP1207563A3 publication Critical patent/EP1207563A3/en
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
    • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
    • H10H20/80—Constructional details
    • H10H20/85—Packages
    • H10H20/857—Interconnections, e.g. lead-frames, bond wires or solder balls
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W72/00—Interconnections or connectors in packages
    • H10W72/851—Dispositions of multiple connectors or interconnections
    • H10W72/874—On different surfaces
    • H10W72/884—Die-attach connectors and bond wires
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W74/00—Encapsulations, e.g. protective coatings
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
    • H10W90/731—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors
    • H10W90/736—Package configurations characterised by the relative positions of pads or connectors relative to package parts of die-attach connectors between a chip and a stacked lead frame, conducting package substrate or heat sink
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
    • H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
    • H10W90/753—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between laterally-adjacent chips
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
    • H10W90/00—Package configurations
    • H10W90/701—Package configurations characterised by the relative positions of pads or connectors relative to package parts
    • H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
    • H10W90/756—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between a chip and a stacked lead frame, conducting package substrate or heat sink
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Definitions

  • This invention relates to light-emitting diodes and, in particular, to electrostatic discharge protection for such light-emitting diodes.
  • LEDs Due to their compact size, high reliability and low power consumption, light-emitting diodes (LEDs) have replaced incandescent bulbs in a variety of applications. However, LEDs are susceptible to damage from electrostatic discharge (ESD), which degrades the performance and reliability of the LED.
  • ESD electrostatic discharge
  • Past attempts to solve these problems have included the incorporation of a power shunting element in the LED package that provides the LED with protection from overvoltages, such as ESD voltages.
  • the power shunting element and LED terminals are coupled in parallel within the LED package.
  • the power shunting element diverts electrical current from the LED to limit voltage across the LED when a certain voltage across the LED is exceeded.
  • An LED assembly incorporating a power shunting element is described in U.S. Patent No. 5,914,501 (the '501 patent) to Hewlett-Packard Company, and that assembly is reproduced in Figure 1.
  • the assembly 10a employs a wire 24a to electrically connect one terminal 15 of the LED 14 to a terminal 12a of the power shunting element 12 and employs another wire 24b to electrically connect the terminal 12a to the positive electrode 22b.
  • the other terminal 17 of the LED 14 and the other terminal 12b of the power shunting element 12 are directly bonded to the negative electrode 22a.
  • a lens 23 encapsulates the assembly.
  • FIG. 2 Another LED assembly 10b (Fig. 2) described in the '501 patent incorporates a power shunting element 12 as a submount for the LED 14.
  • the assembly employs wires 24a and 24b to electrically connect the terminals of the LED 14 and power shunting element 12 to the positive and negative electrodes.
  • a light-emitting diode assembly incorporates a power shunting element to protect against damage from electrical overstress, such as from electrostatic discharge (ESD).
  • the power shunting element is coupled in parallel to the LED within the LED lens assembly itself and protects the LED by diverting electrical current from the LED when a certain voltage across the LED is exceeded.
  • LED assemblies of the present invention employ direct bonding of the electrical contacts of the LED and the power shunting element to the electrodes of the LED assembly, rather than incorporating wire bonds or submount chips.
  • both the LED and the power shunting element are flip-chips having terminals directly bonded to the positive and negative electrodes.
  • a lens material may be formed to encapsulate the LED.
  • the power shunting element may optionally be encapsulated by the lens material.
  • the present invention improves reliability, simplifies manufacturing, and reduces manufacturing costs.
  • Figure 3 is a top view of a light-emitting diode package 28 including a light-emitting diode (LED) 30 and a power shunting element 31 arranged according to a first embodiment of the present invention.
  • LED light-emitting diode
  • the LED 30 and the power shunting element 31 are flip-chips, having terminals on one surface. These terminals are directly bonded to pads 32 and 33 of the respective positive electrode 34 and negative electrode 35.
  • the use of flip-chip bonding of both the LED 30 and the power shunting element 31 allows for the complete elimination of wire bonds from the assembly.
  • the bonding may be by ultrasonic bonding, adhesive bonding, or soldering.
  • flip-chip LED that may be used in the present invention is described in U.S. application serial no. 09/469,657, filed December 22, 1999, entitled III-Nitride Light-Emitting Device With Increased Light Generating Capability, by Michael Krames, Daniel Steigerwald, and others, assigned to the present assignee and incorporated by reference.
  • a flip-chip LED includes a transparent substrate on which various active layers are grown or deposited. The electrical contacts are formed on the grown or deposited layers to electrically contact n and p-type layers of the LED. The LED is then mounted such that the substrate is the primary window for the light emission. In Fig. 4, the flip-chip substrate is facing upward.
  • a lens 40 encapsulates the LED 30, power shunting element 31, and electrodes 34/35, with extensions 42 and 43 of the electrodes 34 and 35, respectively, protruding from the lens 40 downward from the plane of the page to a circuit board or other apparatus.
  • the lens 40 may be a high index epoxy or other material.
  • Figure 4 is a side view of the LED package 28 of Figure 3.
  • the power shunting element is located behind the LED 30 and is obscured from view.
  • the LED 30 terminal 46 is directly bonded to the positive electrode 34.
  • the LED 30 terminal 47 is directly bonded to the negative electrode 35.
  • the power shunting element has similar terminals directly bonded to the positive electrode 34 and negative electrode 35.
  • the heat generated by the LED can be directly extracted by the metal electrodes 34 and 35 serving as heat sinks.
  • Figure 5 is an electrical schematic diagram of the LED 30 and the power shunting element 31 in one embodiment of the present invention.
  • the back-to-back zener diodes 46 and 47 clamp the voltage across the LED 30 to a predetermined voltage and divert current away from the LED 30.
  • the power shunting element 31 protects the LED from electrical overstress, such as that produced by electrostatic discharge.
  • the power shunting element may be any transient voltage suppressor diode.
  • the power shunting element 31 is located outside the lens for increased optical efficiency.

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  • Led Device Packages (AREA)

Abstract

A light-emitting diode (LED) assembly incorporates a power shunting device that prevents damage to an LED due to electrostatic discharge (ESD). The power shunting device protects the LED by diverting electrical current from the LED and limiting the voltage across the LED to a certain voltage. In one embodiment, the LED and power shunting devices are flip-chips having terminals directly bonded to both the positive and negative electrodes, thus enhancing the reliability and ease of construction of the light-emitting diode assembly. A lens encapsulates the LED and optionally encapsulates the power shunting element.

Description

This invention relates to light-emitting diodes and, in particular, to electrostatic discharge protection for such light-emitting diodes.
Due to their compact size, high reliability and low power consumption, light-emitting diodes (LEDs) have replaced incandescent bulbs in a variety of applications. However, LEDs are susceptible to damage from electrostatic discharge (ESD), which degrades the performance and reliability of the LED.
Past attempts to solve these problems have included the incorporation of a power shunting element in the LED package that provides the LED with protection from overvoltages, such as ESD voltages. The power shunting element and LED terminals are coupled in parallel within the LED package. The power shunting element diverts electrical current from the LED to limit voltage across the LED when a certain voltage across the LED is exceeded. An LED assembly incorporating a power shunting element is described in U.S. Patent No. 5,914,501 (the '501 patent) to Hewlett-Packard Company, and that assembly is reproduced in Figure 1. The assembly 10a employs a wire 24a to electrically connect one terminal 15 of the LED 14 to a terminal 12a of the power shunting element 12 and employs another wire 24b to electrically connect the terminal 12a to the positive electrode 22b. The other terminal 17 of the LED 14 and the other terminal 12b of the power shunting element 12 are directly bonded to the negative electrode 22a. A lens 23 encapsulates the assembly.
Another LED assembly 10b (Fig. 2) described in the '501 patent incorporates a power shunting element 12 as a submount for the LED 14. The assembly employs wires 24a and 24b to electrically connect the terminals of the LED 14 and power shunting element 12 to the positive and negative electrodes.
For high reliability, complete elimination of wire bonds is desirable. Furthermore, the wire bonding adds costs and manufacturing time.
According to the present invention, a light-emitting diode assembly incorporates a power shunting element to protect against damage from electrical overstress, such as from electrostatic discharge (ESD). The power shunting element is coupled in parallel to the LED within the LED lens assembly itself and protects the LED by diverting electrical current from the LED when a certain voltage across the LED is exceeded.
LED assemblies of the present invention employ direct bonding of the electrical contacts of the LED and the power shunting element to the electrodes of the LED assembly, rather than incorporating wire bonds or submount chips. In one embodiment, both the LED and the power shunting element are flip-chips having terminals directly bonded to the positive and negative electrodes. A lens material may be formed to encapsulate the LED. The power shunting element may optionally be encapsulated by the lens material.
Thus, the present invention improves reliability, simplifies manufacturing, and reduces manufacturing costs.
  • Fig. 1 is side view of a first embodiment of a light-emitting diode assembly including a power shunting element, as described in U.S. Patent No. 5,914,501;
  • Fig. 2 is side view of a second embodiment of a light-emitting diode assembly including a power shunting element, as described in U.S. Patent No. 5,914,501;
  • Fig. 3 is a top view of a light-emitting diode package including a power shunting element arranged according to a first embodiment of the present invention;
  • Fig. 4 is a side view of the light-emitting diode package illustrated in Fig. 3; and
  • Fig. 5 is a schematic diagram of the light-emitting diode and power shunting element according to one embodiment of the present invention.
    • Figure 3 is a top view of a light-emitting diode package 28 including a light-emitting diode (LED) 30 and a power shunting element 31 arranged according to a first embodiment of the present invention.
    The LED 30 and the power shunting element 31 are flip-chips, having terminals on one surface. These terminals are directly bonded to pads 32 and 33 of the respective positive electrode 34 and negative electrode 35. The use of flip-chip bonding of both the LED 30 and the power shunting element 31 allows for the complete elimination of wire bonds from the assembly. The bonding may be by ultrasonic bonding, adhesive bonding, or soldering.
    One embodiment of a flip-chip LED that may be used in the present invention is described in U.S. application serial no. 09/469,657, filed December 22, 1999, entitled III-Nitride Light-Emitting Device With Increased Light Generating Capability, by Michael Krames, Daniel Steigerwald, and others, assigned to the present assignee and incorporated by reference. Such a flip-chip LED includes a transparent substrate on which various active layers are grown or deposited. The electrical contacts are formed on the grown or deposited layers to electrically contact n and p-type layers of the LED. The LED is then mounted such that the substrate is the primary window for the light emission. In Fig. 4, the flip-chip substrate is facing upward.
    A lens 40 encapsulates the LED 30, power shunting element 31, and electrodes 34/35, with extensions 42 and 43 of the electrodes 34 and 35, respectively, protruding from the lens 40 downward from the plane of the page to a circuit board or other apparatus. The lens 40 may be a high index epoxy or other material.
    Figure 4 is a side view of the LED package 28 of Figure 3. In Figure 4, the power shunting element is located behind the LED 30 and is obscured from view. The LED 30 terminal 46 is directly bonded to the positive electrode 34. The LED 30 terminal 47 is directly bonded to the negative electrode 35. The power shunting element has similar terminals directly bonded to the positive electrode 34 and negative electrode 35.
    By not providing the power shunting element 31 as a submount, in contrast to Fig. 2, the heat generated by the LED can be directly extracted by the metal electrodes 34 and 35 serving as heat sinks.
    Figure 5 is an electrical schematic diagram of the LED 30 and the power shunting element 31 in one embodiment of the present invention. When the voltage applied to the LED 30 exceeds a predetermined threshold voltage, the back-to- back zener diodes 46 and 47 clamp the voltage across the LED 30 to a predetermined voltage and divert current away from the LED 30. Thus, the power shunting element 31 protects the LED from electrical overstress, such as that produced by electrostatic discharge. The power shunting element may be any transient voltage suppressor diode.
    In another embodiment, the power shunting element 31 is located outside the lens for increased optical efficiency.
    While particular embodiments of the present invention have been shown and described, it will be obvious to those skilled in the art that changes and modifications may be made without departing from this invention in its broader aspects and, therefore, the appended claims are to encompass within their scope all such changes and modifications as fall within the true spirit and scope of this invention.

    Claims (12)

    1. A light-emitting diode package, comprising:
      a positive electrode;
      a negative electrode;
      a light-emitting diode having a first electrical contact directly bonded to said positive electrode and a second electrical contact directly bonded to said negative electrode; and
      a power shunting element having a third electrical contact directly bonded to the positive electrode and a fourth electrical contact directly bonded to the negative electrode, said power shunting element shunting electrical current from the light-emitting diode when a voltage applied across the light-emitting diode exceeds a predefined threshold voltage.
    2. The package of claim 1 wherein said diode and power shunting element are flip-chips, wherein said first and third electrical contacts are flip-chip bonded to the positive electrode, and wherein said second and fourth electrical contacts are flip-chip bonded to the negative electrode.
    3. The package of claim 1 wherein the power shunting element includes a back-to-back zener diode configuration.
    4. The package of claim 1 wherein the power shunting element includes a transient voltage suppressor.
    5. The package of claim 1 further comprising a lens encapsulating said diode and said power shunting element.
    6. The package of claim 5 wherein said lens is epoxy.
    7. The package of claim 5 wherein said diode and power shunting elements are flip-chips, wherein said first and third electrical contacts are flip-chip bonded to the positive electrode, and wherein said second and fourth electrical contacts are flip-chip bonded to the negative electrode.
    8. The package of claim 5 wherein the power shunting element includes a back-to-back zener diode configuration.
    9. A method for manufacturing a light-emitting diode package comprising:
      directly bonding a first terminal of a light-emitting diode to a positive electrode and directly bonding a second terminal of said light emitting diode to a negative electrode; and
      directly bonding a third terminal of a power shunting element to the positive electrode and directly bonding a fourth terminal of said power shunting element to the negative electrode, said power shunting element for shunting electrical current from the light-emitting diode when a voltage applied across the light-emitting diode exceeds a predefined threshold voltage.
    10. The method of claim 9 further comprising encapsulating said diode, said power shunting element, said positive electrode, and said negative electrode with a material to form a lens.
    11. The method of claim 9 wherein said diode and power shunting element are flip-chips, and said steps of directly bonding comprise flip-chip bonding said first and third electrical contacts to the positive electrode, and flip-chip bonding said second and fourth electrical contacts to the negative electrode.
    12. The method of claim 9 wherein the power shunting element includes a back-to-back zener diode configuration.
    EP01204132A 2000-11-08 2001-10-29 Direct bonding of flip-chip light-emitting diode and flip-chip ESD protection chip to electrodes in a package Withdrawn EP1207563A3 (en)

    Applications Claiming Priority (2)

    Application Number Priority Date Filing Date Title
    US70915000A 2000-11-08 2000-11-08
    US709150 2000-11-08

    Publications (2)

    Publication Number Publication Date
    EP1207563A2 true EP1207563A2 (en) 2002-05-22
    EP1207563A3 EP1207563A3 (en) 2007-03-21

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    EP (1) EP1207563A3 (en)
    JP (1) JP2002185049A (en)
    KR (1) KR20020035789A (en)

    Cited By (8)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN100369275C (en) * 2004-01-29 2008-02-13 光磊科技股份有限公司 Light-emitting element capable of increasing light-emitting active region area
    CN100368895C (en) * 2006-05-30 2008-02-13 友达光电股份有限公司 Backlight module using light emitting diode
    EP2194761A1 (en) * 2008-12-03 2010-06-09 Panasonic Electric Works Co., Ltd. LED Lighting device
    WO2012151748A1 (en) 2011-05-11 2012-11-15 上舜照明（中国）有限公司 Led chip unit and manufacturing method thereof, and led module
    US9130365B2 (en) 2012-03-14 2015-09-08 General Electric Company Method and system for ultra miniaturized packages for transient voltage suppressors
    US9343446B2 (en) 2011-06-08 2016-05-17 Koninklijke Philips N.V. Diode lighting arrangement
    US11796163B2 (en) 2020-05-12 2023-10-24 Feit Electric Company, Inc. Light emitting device having improved illumination and manufacturing flexibility
    US11876042B2 (en) 2020-08-03 2024-01-16 Feit Electric Company, Inc. Omnidirectional flexible light emitting device

    Families Citing this family (2)

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    Publication number Priority date Publication date Assignee Title
    CN100392885C (en) * 2005-08-18 2008-06-04 璨圆光电股份有限公司 LED structure
    KR100795179B1 (en) 2006-05-30 2008-01-16 삼성전기주식회사 Nitride semiconductor light emitting device

    Family Cites Families (4)

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    Publication number Priority date Publication date Assignee Title
    JPH0725060A (en) * 1993-06-25 1995-01-27 Matsushita Electric Ind Co Ltd Optical print head and manufacturing method thereof
    JP3911839B2 (en) * 1998-04-08 2007-05-09 松下電器産業株式会社 Semiconductor light emitting device
    JP2000012913A (en) * 1998-06-19 2000-01-14 Matsushita Electron Corp Electrostatic protection diode used for semiconductor light emitting device and method of manufacturing the same
    JP4296644B2 (en) * 1999-01-29 2009-07-15 豊田合成株式会社 Light emitting diode

    Cited By (10)

    * Cited by examiner, † Cited by third party
    Publication number Priority date Publication date Assignee Title
    CN100369275C (en) * 2004-01-29 2008-02-13 光磊科技股份有限公司 Light-emitting element capable of increasing light-emitting active region area
    CN100368895C (en) * 2006-05-30 2008-02-13 友达光电股份有限公司 Backlight module using light emitting diode
    EP2194761A1 (en) * 2008-12-03 2010-06-09 Panasonic Electric Works Co., Ltd. LED Lighting device
    WO2012151748A1 (en) 2011-05-11 2012-11-15 上舜照明（中国）有限公司 Led chip unit and manufacturing method thereof, and led module
    US9343446B2 (en) 2011-06-08 2016-05-17 Koninklijke Philips N.V. Diode lighting arrangement
    US9130365B2 (en) 2012-03-14 2015-09-08 General Electric Company Method and system for ultra miniaturized packages for transient voltage suppressors
    US11796163B2 (en) 2020-05-12 2023-10-24 Feit Electric Company, Inc. Light emitting device having improved illumination and manufacturing flexibility
    US12066173B2 (en) 2020-05-12 2024-08-20 Feit Electric Company, Inc. Light emitting device having improved illumination and manufacturing flexibility
    US11876042B2 (en) 2020-08-03 2024-01-16 Feit Electric Company, Inc. Omnidirectional flexible light emitting device
    US12293965B2 (en) 2020-08-03 2025-05-06 Feit Electric Company, Inc. Omnidirectional flexible light emitting device

    Also Published As

    Publication number Publication date
    EP1207563A3 (en) 2007-03-21
    JP2002185049A (en) 2002-06-28
    KR20020035789A (en) 2002-05-15

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